Method And Apparatus For Thermal Dissipation In An Information Handling System

ABSTRACT

A thermal dissipation apparatus includes a primary heat sink. The primary heat sink includes a first base member including a component coupling surface and a secondary heat sink coupling surface, and a plurality of fins extending from the first base member. A secondary heat sink may be provided such that the primary heat sink is operable to provide thermal dissipation in a low profile form factor chassis while the secondary heat sink may be coupled with the primary heat sink to provide more optimal thermal dissipation in a high profile form factor chassis.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to and is a divisional of co-ownedco-pending U.S. patent application Ser. No. 11/089,162, filed Mar. 24,2005, our docket no. 16356.908, which is incorporated herein byreference in its entirety.

BACKGROUND

The present disclosure relates generally to information handlingsystems, and more particularly to providing thermal dissipation in aninformation handling system.

As the value and use of information continues to increase, individualsand businesses seek additional ways to process and store information.One option is an information handling system. An information handlingsystem generally processes, compiles, stores, and/or communicatesinformation or data for business, personal, or other purposes. Becausetechnology and information handling needs and requirements may varybetween different applications, information handling systems may alsovary regarding what information is handled, how the information ishandled, how much information is processed, stored, or communicated, andhow quickly and efficiently the information may be processed, stored, orcommunicated. The variations in information handling systems allow forinformation handling systems to be general or configured for a specificuser or specific use such as financial transaction processing, airlinereservations, enterprise data storage, or global communications. Inaddition, information handling systems may include a variety of hardwareand software components that may be configured to process, store, andcommunicate information and may include one or more computer systems,data storage systems, and networking systems.

Meeting the cooling requirements for information handling systems undera variety of different boundary conditions can be difficult to achieve,and typically requires a number of different thermal solutions resultingin a variety of different thermal dissipation devices which areappropriate for each of the given boundary condition, which can increasecosts.

In addition, industry standards groups are driving form factors forthermal dissipation devices which may not be applicable for theoperating, performance, or volume constraints required by someinformation handling systems. Furthermore, common planar assemblies aredriving thermal solutions that are sub-optimal for some platforms, whichcan result, for example, in a thermal solution for a first platformwhich may limit the thermal dissipation device height for secondplatform, even though that second platform provides the additionalheight needed for a more appropriate thermal solution.

Accordingly, it would be desirable to provide for enhanced thermaldissipation in an information handling system absent the disadvantagesdiscussed above.

SUMMARY

According to one embodiment, a thermal dissipation apparatus is providedthat includes a primary heat sink. The primary heat sink includes afirst base member including a component coupling surface and a secondaryheat sink coupling surface, and a plurality of fins extending from thefirst base member.

A principal advantage of this embodiment is that a thermal dissipationapparatus provides thermal dissipation in a low profile form factorchassis but allows more optimal thermal dissipation in a high profileform factor chassis.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view illustrating an embodiment of an informationhandling system.

FIG. 2 is a perspective view illustrating an embodiment of a primaryheat sink.

FIG. 3 is a perspective view illustrating an embodiment of a secondaryheat sink which may be used with the primary heat sink of FIG. 2

FIG. 4 is a perspective view illustrating an embodiment of a heatproducing component used with the primary heat sink of FIG. 2 and whichmay be used with the secondary heat sink of FIG. 3.

FIG. 5 a is a perspective view illustrating an embodiment of the heatproducing component of FIG. 4 mounted in a low profile form factorchassis.

FIG. 5 b is a perspective view illustrating an embodiment of the primaryheat sink of FIG. 2 coupled to the heat producing component and a lowprofile form factor chassis of FIG. 5 a.

FIG. 6 a is a perspective view illustrating an embodiment of the heatproducing component of FIG. 4 mounted in a high profile form factorchassis.

FIG. 6 b is a perspective view illustrating an embodiment of the primaryheat sink of FIG. 2 coupled to the heat producing component and a highprofile form factor chassis of FIG. 6 a.

FIG. 6 c is a perspective view illustrating an embodiment of thesecondary heat sink of FIG. 3 coupled to the primary heat sink, heatproducing component, and a high profile form factor chassis of FIG. 6 b.

FIG. 7 is a perspective view illustrating an embodiment of a primaryheat sink

FIG. 8 is a perspective view illustrating an embodiment of the primaryheat sink of FIG. 7 coupled to the heat producing component and a lowprofile form factor chassis of FIG. 5 a.

FIG. 9 a is a perspective view illustrating an embodiment of the primaryheat sink of FIG. 7 coupled to the heat producing component and a highprofile form factor chassis of FIG. 6 a.

FIG. 9 b is a perspective view illustrating an embodiment of thesecondary heat sink of FIG. 3 coupled to the primary heat sink, heatproducing component, and a high profile form factor chassis of FIG. 9 a.

DETAILED DESCRIPTION

For purposes of this disclosure, an information handling system mayinclude any instrumentality or aggregate of instrumentalities operableto compute, classify, process, transmit, receive, retrieve, originate,switch, store, display, manifest, detect, record, reproduce, handle, orutilize any form of information, intelligence, or data for business,scientific, control, entertainment, or other purposes. For example, aninformation handling system may be a personal computer, a PDA, aconsumer electronic device, a network server or storage device, a switchrouter or other network communication device, or any other suitabledevice and may vary in size, shape, performance, functionality, andprice. The information handling system may include memory, one or moreprocessing resources such as a central processing unit (CPU) or hardwareor software control logic. Additional components of the informationhandling system may include one or more storage devices, one or morecommunications ports for communicating with external devices as well asvarious input and output (I/O) devices, such as a keyboard, a mouse, anda video display. The information handling system may also include one ormore buses operable to transmit communications between the varioushardware components.

In one embodiment, information handling system 10, FIG. 1, includes amicroprocessor 12, which is connected to a bus 14. Bus 14 serves as aconnection between microprocessor 12 and other components of computersystem 10. An input device 16 is coupled to microprocessor 12 to provideinput to microprocessor 12. Examples of input devices include keyboards,touchscreens, and pointing devices such as mouses, trackballs andtrackpads. Programs and data are stored on a mass storage device 18,which is coupled to microprocessor 12. Mass storage devices include suchdevices as hard disks, optical disks, magneto-optical drives, floppydrives and the like. Computer system 10 further includes a display 20,which is coupled to microprocessor 12 by a video controller 22. A systemmemory 24 is coupled to microprocessor 12 to provide the microprocessorwith fast storage to facilitate execution of computer programs bymicroprocessor 12. In an embodiment, a chassis 26 may house some or allof the components of the information handling system 10. It should beunderstood that other busses and intermediate circuits can be deployedbetween the components described above and microprocessor 12 tofacilitate interconnection between the components and themicroprocessor.

Referring now to FIG. 2, a primary heat sink 100 is illustrated. Primaryheat sink 100 includes a secondary heat sink coupling surface 102 on itstop surface, and a bottom surface 104 located opposite the secondaryheat sink coupling surface 102. A plurality of long fins 106 a extendfrom the bottom surface 104 of the primary heat sink 100 in a spacedapart relationship and are located adjacent the distal ends of theprimary heat sink 100. A plurality of short fins 106 b extend from thebottom surface 104 of the primary heat sink 100 in a spaced apartrelationship and located adjacent the plurality of long fins 106 a. Acomponent coupling surface 108 is centrally located on the bottomsurface 104 and is positioned between the plurality of long fins 106 aand short fins 106 b.

Referring now to FIG. 3, a secondary heat sink 200 is illustrated.Secondary heat sink 200 includes a primary heat sink coupling surface202 a located on its bottom surface and a top surface 202 b locatedopposite the primary heat sink coupling surface 202 a. A plurality offins 204 extend from the top surface 202 b of the secondary heat sink200 in a spaced apart relationship. In an embodiment, the secondary heatsink 200 may be a conventional heat sink known in the art.

Referring now to FIG. 4, a heat producing component 300 is illustrated.Heat producing component 300 includes a first surface 302 a and amounting surface 302 b located opposite the first surface 302 a. A die304 extends from the first surface 302 a and includes a top surface 306a and a bottom surface which is part of the mounting surface 302 b. Inan embodiment, the heat producing component 300 may be, for example, anexposed die chip set, a processor, or a variety of other heat producingcomponents known in the art. In an embodiment, the heat producingcomponent 300 may be one of the components of the information handlingsystem 10, illustrated in FIG. 1. In an embodiment, the die 304 mayinclude a lid.

Referring now to FIG. 5 a, in operation, the heat producing component300 may be mounted in a low profile form factor chassis 400. Low profileform factor chassis 400 includes a board 402, a lid 404, and provides aninternal height A in the low profile form factor chassis 400 between theboard 402 and the lid 404. In an embodiment, the low profile form factorchassis 400 may be the chassis 26 illustrated in FIG. 1. The mountingsurface 302 b of heat producing component 300 is mounted to the board402 using methods known in the art and positioned between the board 402and the lid 404. In an embodiment, the internal height A of the chassis400 may be determined to be sufficient to house only the primary heatsink 100, illustrated in FIG. 2, when the primary heat sink is coupledto the heat producing component 300.

Referring now to FIG. 5 b, the primary heat sink 100 may then be coupledto the die 300. Primary heat sink 100 is positioned over heat producingcomponent 300 such that bottom surface 104 of primary heat sink 100 isfacing the top surface 306 a of die 304. Component coupling surface 108is then lined up and engaged with top surface 306 a of die 304. Thecomponent coupling surface 108 on primary heat sink 100 may be coupledto the top surface 306 a of die 304 by a variety of methods known in theart such as, for example, an adhesive thermal interface material and/ora mechanical fastener. With the primary heat sink 100 coupled to theheat producing component 300 in low profile form factor chassis 400, aninternal height B between the secondary heat sink coupling surface 102and the lid 404 of chassis 400 is insufficient to allow the secondaryheat sink 200, illustrated in FIG. 3, to be coupled to the primary heatsink 100.

Referring now to FIG. 6 a, in an embodiment, the heat producingcomponent 300 may be mounted in a high profile form factor chassis 500.High profile form factor chassis 500 is substantially similar to lowprofile form factor chassis 400, including a board 402 and a lid 404,with the exception of high profile form factor chassis 500 providing aninternal height C in the high profile form factor chassis 500 betweenthe board 402 and the lid 404 which is greater than the internal heightA provided by the low profile form factor chassis 400. In an embodiment,the high profile form factor chassis 500 may be the chassis 26illustrated in FIG. 1. The mounting surface 302 b of heat producingcomponent 300 is mounted to the board 402 using methods known in the artand positioned between the board 402 and the lid 404. In an embodiment,the internal height C of the chassis 500 may be determined to besufficient to house the primary heat sink 100, illustrated in FIG. 2,with the secondary heat sink 200, illustrated in FIG. 3, coupled to theprimary heat sink 100.

Referring now to FIG. 6 b, the primary heat sink 100 may then be coupledto the die 300. Primary heat sink 100 is positioned over heat producingcomponent 300 such that bottom surface 104 of primary heat sink 100 isfacing the top surface 306 a of die 304. Component coupling surface 108is then lined up, engaged with, and coupled to the top surface 306 a ofdie 304. The component coupling surface 108 on primary heat sink 100 maybe coupled to the top surface of die 304 by a variety of methods knownin the art such as, for example, an adhesive thermal interface materialand/or a mechanical fastener. With the primary heat sink 100 coupled tothe heat producing component 300 in high profile form factor chassis500, an internal height D between the secondary heat sink couplingsurface 102 and the lid 404 of chassis 500 is sufficient to allow thesecondary heat sink 200, illustrated in FIG. 3, to be coupled to theprimary heat sink 100.

Referring now to FIGS. 3, 6 b, and 6 c, the secondary heat sink 200 maythen be coupled to the primary heat sink 100. Secondary heat sink 200 ispositioned in the high profile form factor chassis 500 such that bottomsurface 202 a of secondary heat sink 200 is adjacent secondary heat sinkcoupling surface 102 on primary heat sink 100. Secondary heat sink 200may then be coupled to the primary heat sink 100 with the use of anadhesive thermal interface material 600 which couples the bottom surface202 a of secondary heat sink 200 to the secondary heat sink couplingsurface 102 of primary heat sink 100. In an embodiment, the bottomsurface 202 a of secondary heat sink 200 may be coupled to the secondaryheat sink coupling surface 102 on primary heat sink 100 usingalternative methods known in the art such as, for example, with the useof mechanical fasteners. Thus, the primary heat sink 100 and thesecondary heat sink 200 provide a thermal dissipation apparatus whichmay be used to provide thermal dissipation in a low profile form factorchassis but allows more optimal thermal dissipation in a high profileform factor chassis.

Referring now to FIG. 7, an embodiment of a primary heat sink 700 isillustrated. Primary heat sink 700 includes a first base member 702having a top surface 702 a and a bottom surface 702 b located oppositethe top surface 702 a. A second base member 704 includes a secondaryheat sink coupling surface 704 a located on its top surface, a bottomsurface 704 b located opposite the secondary heat sink coupling surface704 a, and is spaced apart and coupled to the first base member 702 by aplurality of fins 706 extending between the top surface 702 a on firstbase member 702 and the bottom surface 704 b on second base member 704.

Referring now to FIG. 5 a, in operation, the heat producing component300 may be mounted in a low profile form factor chassis 400. Low profileform factor chassis 400 includes a board 402, a lid 404, and provides aninternal height A in the low profile form factor chassis 400 between theboard 402 and the lid 404. In an embodiment, the low profile form factorchassis 400 may be the chassis 26 illustrated in FIG. 1. The mountingsurface 302 b of heat producing component 300 is mounted to the board402 using methods known in the art and positioned between the board 402and the lid 404. In an embodiment, the internal height A of the chassis400 may be determined to be sufficient to house only the primary heatsink 700, illustrated in FIG. 7, when the primary heat sink 700 iscoupled to the heat producing component 300.

Referring now to FIG. 8, the primary heat sink 700 may then be coupledto the die 300. Primary heat sink 700 is positioned over heat producingcomponent 300 such that bottom surface 702 b on first base member 702 ofprimary heat sink 100 is facing the top surface 306 a of die 304. Bottomsurface 702 b on first base member 702 is then engaged with top surface306 a of die 304. The bottom surface 702 b on first base member 702 maybe coupled to the top surface of die 304 by a variety of methods knownin the art such as, for example, an adhesive thermal interface materialand/or a mechanical fastener. With the primary heat sink 700 coupled tothe heat producing component 300 in low profile form factor chassis 400,an internal height E between the secondary heat sink coupling surface704 a and the lid 404 of chassis 400 is insufficient to allow thesecondary heat sink 200, illustrated in FIG. 3, to be coupled to theprimary heat sink 700.

Referring now to FIG. 6 a, in an embodiment, the heat producingcomponent 300 may be mounted in a high profile form factor chassis 500.High profile form factor chassis 500 is substantially similar to lowprofile form factor chassis 400, including a board 402 and a lid 404,with the exception of high profile form factor chassis 500 providing aninternal height C in the high profile form factor chassis 500 betweenthe board 402 and the lid 404 which is greater than the internal heightA provided by the low profile form factor chassis 400. In an embodiment,the high profile form factor chassis 500 may be the chassis 26illustrated in FIG. 1. The mounting surface 302 b of heat producingcomponent 300 is mounted to the board 402 using methods known in the artand positioned between the board 402 and the lid 404. In an embodiment,the internal height C of the chassis 500 may be determined to besufficient to house the primary heat sink 700, illustrated in FIG. 7,with the secondary heat sink 200, illustrated in FIG. 3, coupled to theprimary heat sink 700.

Referring now to FIG. 9 a, the primary heat sink 700 may then be coupledto the die 304. Primary heat sink 700 is positioned over heat producingcomponent 300 such that bottom surface 702 b on first base member 702 ofprimary heat sink 700 is facing the top surface 306 a of die 304. Bottomsurface 702 b on first base member 702 is then coupled to and engagedwith top surface 306 a of die 304. The bottom surface 702 b on firstbase member 702 may be coupled to the top surface of die 304 by avariety of methods known in the art such as, for example, an adhesivethermal interface material and/or a mechanical fastener. With theprimary heat sink 700 coupled to the heat producing component 300 inhigh profile form factor chassis 500, an internal height F between thesecondary heat sink coupling surface 704 a and the lid 404 of chassis400 is sufficient to allow the secondary heat sink 200, illustrated inFIG. 3, to be coupled to the primary heat sink 700.

Referring now to FIGS. 3, 9 a, and 9 b, the secondary heat sink 200 maythen be coupled to the primary heat sink 700. Secondary heat sink 200 ispositioned in the high profile form factor chassis 500 such that bottomsurface 202 a of secondary heat sink 200 is adjacent secondary heat sinkcoupling surface 704 a on second base member 704 of primary heat sink700. Secondary heat sink 200 may then be coupled to the primary heatsink 700 with the use of an adhesive thermal interface material 800which couples the bottom surface 202 a of secondary heat sink 200 to thesecondary heat sink coupling surface 704 a on second base member 704 ofprimary heat sink 700. In an embodiment, the bottom surface 202 a ofsecondary heat sink 200 may be coupled to the secondary heat sinkcoupling surface 704 a on second base member 704 of primary heat sink700 using alternative methods known in the art such as, for example,with the use of mechanical fasteners. Thus, the primary heat sink 700and the secondary heat sink 200 provide a thermal dissipation apparatuswhich may be used to provide thermal dissipation in a low profile formfactor chassis but allows more optimal thermal dissipation in a highprofile form factor chassis.

Although illustrative embodiments have been shown and described, a widerange of modification, change and substitution is contemplated in theforegoing disclosure and in some instances, some features of theembodiments may be employed without a corresponding use of otherfeatures. Accordingly, it is appropriate that the appended claims beconstrued broadly and in a manner consistent with the scope of theembodiments disclosed herein.

1. A variable thermal dissipation apparatus comprising: a first chassisand a second chassis, wherein the first chassis defines a first internalheight and the second chassis defines a second internal height that isgreater than the first internal height; a plurality of first heat sinks,wherein each of the first heat sinks are sized to allow the first heatsink to be positioned within the first internal height defined by thefirst chassis and within the second internal height defined by thesecond chassis; a second heat sink, wherein the second heat sink issized to allow the combination of the second heat sink mounted to thefirst heat sink to be positioned within the second internal heightdefined by the second chassis but not positioned within the firstinternal height defined by the first chassis; at least one of the firstheat sinks mounted on each of a heat producing component that is locatedin the first chassis and a heat producing component that is located inthe second chassis; and the second heat sink being mounted on the firstheat sink that is mounted on the heat producing component located in thesecond chassis.
 2. The apparatus of claim 1 wherein the first heat sinkincludes fins all having an equal height.
 3. The apparatus of claim 1wherein the first heat sink includes fins having variable heights. 4.The apparatus of claim 2 wherein the first heat sink includes a pair ofbase members and the fins extend between the base members.
 5. Theapparatus of claim 3 wherein the first heat sink includes a base memberand the fins extend from the base member.
 6. An information handlingsystem (IHS) comprising: a first chassis defining a first internalheight; the IHS being in the first chassis, wherein the IHS includes aheat producing component; a first heat sink on the heat producingcomponent, wherein the first heat sink is sized to allow the first heatsink to be positioned within the first internal height defined by thefirst chassis; the first chassis being replaced with a second chassis,wherein the second chassis defines a second internal height that isgreater than the first internal height; and whereby, in the secondchassis, added space is provided for mounting a second heat sink on thefirst heat sink, wherein the second heat sink is sized to allow thecombination of the second heat sink mounted to the first heat sink to bepositioned within the second internal height defined by the secondchassis but not positioned within the first internal height defined bythe first chassis.
 7. The system of claim 6 wherein the first heat sinkincludes fins each having an equal height.
 8. The system of claim 7wherein the first heat sink includes a pair of base members and the finsextend between the base members.
 9. The system of claim 6 wherein thefirst heat sink includes fins having variable heights.
 10. The system ofclaim 9 wherein the first heat sink includes a base member and the finsextend from the base member.
 11. The system of claim 10 wherein the finsextend toward the heat producing component.